Microsoft cluster services provide availability of application, however require shared storage which is still a single point of failure as well as requiring expensive enterprise licensing. Double-Take Availability Application Manager or DTAAM allows for similar configuration of 2 windows servers but with replicated storage rather then shared, ensuring lower cost of solution, and nothing shared redundancy. Other then the wizard driven applications to protect seen below, DTAAM can be configured to support variety of other applications.
Failover works by having a dormant application installed on a second server with it’s services stopped. Upon failover, either IP or DNS change occurs pointing the users to the target server. Necessary changes are made to Active Directory to ensure user requests are passed through correctly to the target server. You may also configure many servers to one, one to many, or daisy-chain.
Failback allows users to keep working while data restore is occurring in the background!
Most clusters require the use of shared storage. What about DR ? Double-take comes to the
challenge by allowing replication of clustered shared disk to either another cluster or a standalone
server! Failover and failback works much the same as server to server.
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